Small cleanups to openpty().

- Pass O_NOCTTY to posix_openpt(2). This makes the implementation work
  consistently on implementations that make the PTY the controlling TTY
  by default.

- Call unlockpt() before opening the slave device. POSIX mentions that
  de slave device should only be opened after grantpt() and unlockpt()
  have been called.

- Replace some redundant code by a label.

In theory we could remove a lot of code from openpty() on FreeBSD
-CURRENT, because grantpt(), unlockpt() and revoke() are not needed in
our implementation. We'd better keep them there. This makes the code
still work with older FreeBSD releases and even makes it work on other
non-BSD operating systems.

I've compiled openpty() on Linux. You only need to remove the revoke()
call, because revoke() on Linux always returns -1. Apart from that, it
seems to work like it should.

Reviewed by:	jhb

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